code: def test_degree_pearson_assortativity_multigraph(self):
      r = nx.degree_pearson_correlation_coefficient(self.M)
      np.testing.assert_almost_equal(r, -1.0 / 7.0, decimal=4)
  
imports: import pytest
  import networkx
  from networkx.algorithms.assortativity.correlation import attribute_ac
  from .base_test import BaseTestAttributeMixing, BaseTestDegreeMixing
label_desc: Use image node_id 9 for calling the TestDegreeMixingCorrelation obj's underlying member method code with example usage: obj.test_degree_pearson_assortativity_multigraph() without return types